Process for waterproofing portland-cement concrete



P' aa sate. 14, 1926.)

UNITED STATES PATENT OFFICE. I

EDWIN C. E. LORD, OI wasnmeron, DISTRICT COLUMBIA, DEDICATED TO THE GOVERNMENT AND THE PEOPLE OF THE UNITED STATES OF AMERICA.

PROCESS FOR WATERPROOFING DOBTLAND-CEMENT CONCRETE.

Application filed December 14, 1925. Serial No. 75,475.

(GRANTED UHDER THE ACT OF HEB-GE 3, 1883; 22 STAT. L. 625.)

This application is "made under the act of March 3, 1883, cha ter 143 (22 Stat. 625) and the invention herein described and claimed may be used by the-Government of l the United States or any -ofits oflicers or employees in the prosecution of work for the Government, or by any person in the I United States, without payment to me of anglroyalty thereon. y process is based on the water repellant properties of 'paraflin or similar material when brought in intimate contact with the constituents of Portland cement concrete.-

The process consists in incorporating parafiin, or similar material, with the constituents of the concrete in such a manner that all constituents are sufficiently coated with the waterproofing material to revent the ingress of water or other li ui s after the concrete has properly set an hardened. In order to attain this desired effect I first dissolve parafiin, or similar material,

with kerosene 1n suflicient quantity to produce a '20 per cent solution-by weight of parafi'm. I then unite this solution with boiling water containing a proximately 1 per cent by weight of or nary laundry soap and stir vigorously until the 'paraflin I0 assumes the form of a perfectly stable wil accomplish this efi'ect. An example of the process is as follows: I mixed 20- 0 ounces of paraffin with 80 ounces of kerosene and to this mixture I added 1 gallon of boiling water which contained 1 per cent by weight of ordinary laundry soap; then I stirred vigorously until the paraflinkerosene solution assumed the form of a perfectly stable emulsion with the .'soapwater solution; this mixture was then combined with the mixing water used in making up the concrete in the proportion of 1 so to 3.

I claim A process for waterproofing Portland cement concrete consisting in 1ntroducing into the water with which the cement is to be mixed, paraflin emulsified with kerosene and soap water, to prevent the ingress of water and other liquids after the concrete has properly set and hardened.

EDWIN C. E. LORD. 

